code: def test_to_dict(self):
      document = Document(
          content="I thought a lot about this. The answer is 42."
      )
      answer = ExtractedAnswer(
          data="42",
          query="What is the answer?",
          document=document,
          context="The answer is 42.",
          score=1.0,
          document_offset=ExtractedAnswer.Span(42, 44),
          context_offset=ExtractedAnswer.Span(14, 16),
          meta={"meta_key": "meta_value"},
      )
      assert answer.to_dict() == {
          "type": "haystack.dataclasses.answer.ExtractedAnswer",
          "init_parameters": {
              "data": "42",
              "query": "What is the answer?",
              "document": document.to_dict(flatten=False),
              "context": "The answer is 42.",
              "score": 1.0,
              "document_offset": {"start": 42, "end": 44},
              "context_offset": {"start": 14, "end": 16},
              "meta": {"meta_key": "meta_value"},
          },
      }
  
file_path: haystack/test/dataclasses/test_answer.py
imports: from pandas import DataFrame
  from haystack.dataclasses.answer import Answer, ExtractedAnswer, ExtractedTableAnswer, GeneratedAnswer
  from haystack.dataclasses.document import Document
label_desc: Use image node_id 3 for calling the TestExtractedAnswer obj's underlying member method code with example usage: obj.test_to_dict() without return types